﻿<!DOCTYPE html>
<html>

<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>html5实现鼠标点击烟花播放效果</title>
    <style>
        html,
        body {
            height: 100%;
            margin: 0;
            padding: 0
        }

        ul,
        li {
            text-indent: 0;
            text-decoration: none;
            margin: 0;
            padding: 0
        }

        img {
            border: 0
        }

        body {
            background-color: #000;
            color: #999;
            font: 100%/18px helvetica, arial, sans-serif
        }

        canvas {
            cursor: crosshair;
            display: block;
            left: 0;
            position: absolute;
            top: 0;
            z-index: 20
        }
    </style>
</head>

<body>
    <script type="text/javascript" src="js/jquery-2.0.0.min.js"></script>
    <script type="text/javascript">
        $(function () {
            var Fireworks = function () {
                var self = this;
                var rand = function (rMi, rMa) {
                    return ~~((Math.random() * (rMa - rMi + 1)) + rMi);
                }
                var hitTest = function (x1, y1, w1, h1, x2, y2, w2, h2) {
                    return !(x1 + w1 < x2 || x2 + w2 < x1 || y1 + h1 < y2 || y2 + h2 < y1);
                };
                window.requestAnimFrame = function () {
                    return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window
                        .mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame ||
                        function (a) {
                            window.setTimeout(a, 1E3 / 60)
                        }
                }();

                self.init = function () {
                    self.canvas = document.createElement('canvas');
                    self.canvas.width = self.cw = $(window).innerWidth();
                    self.canvas.height = self.ch = $(window).innerHeight();
                    self.particles = [];
                    self.partCount = 150;
                    self.fireworks = [];
                    self.mx = self.cw / 2;
                    self.my = self.ch / 2;
                    self.currentHue = 30;
                    self.partSpeed = 5;
                    self.partSpeedVariance = 10;
                    self.partWind = 50;
                    self.partFriction = 5;
                    self.partGravity = 1;
                    self.hueMin = 0;
                    self.hueMax = 360;
                    self.fworkSpeed = 4;
                    self.fworkAccel = 10;
                    self.hueVariance = 30;
                    self.flickerDensity = 25;
                    self.showShockwave = true;
                    self.showTarget = false;
                    self.clearAlpha = 25;

                    $(document.body).append(self.canvas);
                    self.ctx = self.canvas.getContext('2d');
                    self.ctx.lineCap = 'round';
                    self.ctx.lineJoin = 'round';
                    self.lineWidth = 1;
                    self.bindEvents();
                    self.canvasLoop();

                    self.canvas.onselectstart = function () {
                        return false;
                    };
                };

                self.createParticles = function (x, y, hue) {
                    var countdown = self.partCount;
                    while (countdown--) {
                        var newParticle = {
                            x: x,
                            y: y,
                            coordLast: [{
                                    x: x,
                                    y: y
                                },
                                {
                                    x: x,
                                    y: y
                                },
                                {
                                    x: x,
                                    y: y
                                }
                            ],
                            angle: rand(0, 360),
                            speed: rand(((self.partSpeed - self.partSpeedVariance) <= 0) ? 1 : self
                                .partSpeed - self.partSpeedVariance, (self.partSpeed + self.partSpeedVariance)
                            ),
                            friction: 1 - self.partFriction / 100,
                            gravity: self.partGravity / 2,
                            hue: rand(hue - self.hueVariance, hue + self.hueVariance),
                            brightness: rand(50, 80),
                            alpha: rand(40, 100) / 100,
                            decay: rand(10, 50) / 1000,
                            wind: (rand(0, self.partWind) - (self.partWind / 2)) / 25,
                            lineWidth: self.lineWidth
                        };
                        self.particles.push(newParticle);
                    }
                };


                self.updateParticles = function () {
                    var i = self.particles.length;
                    while (i--) {
                        var p = self.particles[i];
                        var radians = p.angle * Math.PI / 180;
                        var vx = Math.cos(radians) * p.speed;
                        var vy = Math.sin(radians) * p.speed;
                        p.speed *= p.friction;

                        p.coordLast[2].x = p.coordLast[1].x;
                        p.coordLast[2].y = p.coordLast[1].y;
                        p.coordLast[1].x = p.coordLast[0].x;
                        p.coordLast[1].y = p.coordLast[0].y;
                        p.coordLast[0].x = p.x;
                        p.coordLast[0].y = p.y;

                        p.x += vx;
                        p.y += vy;
                        p.y += p.gravity;

                        p.angle += p.wind;
                        p.alpha -= p.decay;

                        if (!hitTest(0, 0, self.cw, self.ch, p.x - p.radius, p.y - p.radius, p.radius *
                                2, p.radius * 2) || p.alpha < .05) {
                            self.particles.splice(i, 1);
                        }
                    };
                };

                self.drawParticles = function () {
                    var i = self.particles.length;
                    while (i--) {
                        var p = self.particles[i];

                        var coordRand = (rand(1, 3) - 1);
                        self.ctx.beginPath();
                        self.ctx.moveTo(Math.round(p.coordLast[coordRand].x), Math.round(p.coordLast[
                            coordRand].y));
                        self.ctx.lineTo(Math.round(p.x), Math.round(p.y));
                        self.ctx.closePath();
                        self.ctx.strokeStyle = 'hsla(' + p.hue + ', 100%, ' + p.brightness + '%, ' + p.alpha +
                            ')';
                        self.ctx.stroke();

                        if (self.flickerDensity > 0) {
                            var inverseDensity = 50 - self.flickerDensity;
                            if (rand(0, inverseDensity) === inverseDensity) {
                                self.ctx.beginPath();
                                self.ctx.arc(Math.round(p.x), Math.round(p.y), rand(p.lineWidth, p.lineWidth +
                                    3) / 2, 0, Math.PI * 2, false)
                                self.ctx.closePath();
                                var randAlpha = rand(50, 100) / 100;
                                self.ctx.fillStyle = 'hsla(' + p.hue + ', 100%, ' + p.brightness +
                                    '%, ' + randAlpha + ')';
                                self.ctx.fill();
                            }
                        }
                    };
                };


                self.createFireworks = function (startX, startY, targetX, targetY) {
                    var newFirework = {
                        x: startX,
                        y: startY,
                        startX: startX,
                        startY: startY,
                        hitX: false,
                        hitY: false,
                        coordLast: [{
                                x: startX,
                                y: startY
                            },
                            {
                                x: startX,
                                y: startY
                            },
                            {
                                x: startX,
                                y: startY
                            }
                        ],
                        targetX: targetX,
                        targetY: targetY,
                        speed: self.fworkSpeed,
                        angle: Math.atan2(targetY - startY, targetX - startX),
                        shockwaveAngle: Math.atan2(targetY - startY, targetX - startX) + (90 * (
                            Math.PI / 180)),
                        acceleration: self.fworkAccel / 100,
                        hue: self.currentHue,
                        brightness: rand(50, 80),
                        alpha: rand(50, 100) / 100,
                        lineWidth: self.lineWidth
                    };
                    self.fireworks.push(newFirework);

                };


                self.updateFireworks = function () {
                    var i = self.fireworks.length;
                    while (i--) {
                        var f = self.fireworks[i];
                        self.ctx.lineWidth = f.lineWidth;
                        vx = Math.cos(f.angle) * f.speed,
                        vy = Math.sin(f.angle) * f.speed;
                        f.speed *= 1 + f.acceleration;
                        f.coordLast[2].x = f.coordLast[1].x;
                        f.coordLast[2].y = f.coordLast[1].y;
                        f.coordLast[1].x = f.coordLast[0].x;
                        f.coordLast[1].y = f.coordLast[0].y;
                        f.coordLast[0].x = f.x;
                        f.coordLast[0].y = f.y;

                        if (f.startX >= f.targetX) {
                            if (f.x + vx <= f.targetX) {
                                f.x = f.targetX;
                                f.hitX = true;
                            } else {
                                f.x += vx;
                            }
                        } else {
                            if (f.x + vx >= f.targetX) {
                                f.x = f.targetX;
                                f.hitX = true;
                            } else {
                                f.x += vx;
                            }
                        }

                        if (f.startY >= f.targetY) {
                            if (f.y + vy <= f.targetY) {
                                f.y = f.targetY;
                                f.hitY = true;
                            } else {
                                f.y += vy;
                            }
                        } else {
                            if (f.y + vy >= f.targetY) {
                                f.y = f.targetY;
                                f.hitY = true;
                            } else {
                                f.y += vy;
                            }
                        }

                        if (f.hitX && f.hitY) {
                            self.createParticles(f.targetX, f.targetY, f.hue);
                            self.fireworks.splice(i, 1);

                        }
                    };
                };

                self.drawFireworks = function () {
                    var i = self.fireworks.length;
                    self.ctx.globalCompositeOperation = 'lighter';
                    while (i--) {
                        var f = self.fireworks[i];
                        self.ctx.lineWidth = f.lineWidth;

                        var coordRand = (rand(1, 3) - 1);
                        self.ctx.beginPath();
                        self.ctx.moveTo(Math.round(f.coordLast[coordRand].x), Math.round(f.coordLast[
                            coordRand].y));
                        self.ctx.lineTo(Math.round(f.x), Math.round(f.y));
                        self.ctx.closePath();
                        self.ctx.strokeStyle = 'hsla(' + f.hue + ', 100%, ' + f.brightness + '%, ' + f.alpha +
                            ')';
                        self.ctx.stroke();

                        if (self.showTarget) {
                            self.ctx.save();
                            self.ctx.beginPath();
                            self.ctx.arc(Math.round(f.targetX), Math.round(f.targetY), rand(1, 8), 0,
                                Math.PI * 2, false)
                            self.ctx.closePath();
                            self.ctx.lineWidth = 1;
                            self.ctx.stroke();
                            self.ctx.restore();
                        }

                        if (self.showShockwave) {
                            self.ctx.save();
                            self.ctx.translate(Math.round(f.x), Math.round(f.y));
                            self.ctx.rotate(f.shockwaveAngle);
                            self.ctx.beginPath();
                            self.ctx.arc(0, 0, 1 * (f.speed / 5), 0, Math.PI, true);
                            self.ctx.strokeStyle = 'hsla(' + f.hue + ', 100%, ' + f.brightness + '%, ' +
                                rand(25, 60) / 100 + ')';
                            self.ctx.lineWidth = f.lineWidth;
                            self.ctx.stroke();
                            self.ctx.restore();
                        }
                    };
                };

                self.bindEvents = function () {
                    $(window).on('resize', function () {
                        clearTimeout(self.timeout);
                        self.timeout = setTimeout(function () {
                            self.canvas.width = self.cw = $(window).innerWidth();
                            self.canvas.height = self.ch = $(window).innerHeight();
                            self.ctx.lineCap = 'round';
                            self.ctx.lineJoin = 'round';
                        }, 100);
                    });

                    $(self.canvas).on('mousedown', function (e) {
                        self.mx = e.pageX - self.canvas.offsetLeft;
                        self.my = e.pageY - self.canvas.offsetTop;
                        self.currentHue = rand(self.hueMin, self.hueMax);
                        self.createFireworks(self.cw / 2, self.ch, self.mx, self.my);

                        $(self.canvas).on('mousemove.fireworks', function (e) {
                            self.mx = e.pageX - self.canvas.offsetLeft;
                            self.my = e.pageY - self.canvas.offsetTop;
                            self.currentHue = rand(self.hueMin, self.hueMax);
                            self.createFireworks(self.cw / 2, self.ch, self.mx, self.my);
                        });
                    });

                    $(self.canvas).on('mouseup', function (e) {
                        $(self.canvas).off('mousemove.fireworks');
                    });

                }

                self.clear = function () {
                    self.particles = [];
                    self.fireworks = [];
                    self.ctx.clearRect(0, 0, self.cw, self.ch);
                };


                self.canvasLoop = function () {
                    requestAnimFrame(self.canvasLoop, self.canvas);
                    self.ctx.globalCompositeOperation = 'destination-out';
                    self.ctx.fillStyle = 'rgba(0,0,0,' + self.clearAlpha / 100 + ')';
                    self.ctx.fillRect(0, 0, self.cw, self.ch);
                    self.updateFireworks();
                    self.updateParticles();
                    self.drawFireworks();
                    self.drawParticles();

                };

                self.init();

            }
            var fworks = new Fireworks();

        });
    </script>
</body>

</html>